Electrical Engineering Materials MCQ

Test your knowledge with important Electrical Engineering Materials MCQ and their applications. These MCQs are beneficial for competitive exams too. Explore 30 + more Electrical Engineering Materials MCQs at Bissoy

• _______ is an example of piezoelectric material.
  ক

  Glass

  খ

  Quartz

  গ

  Corrundum

  ঘ

  Neoprene
• Is the property of absorbing moisture from atmosphere.
  ক

  Solubility

  খ

  Viscosity

  গ

  Porosity

  ঘ

  Hygroscopicity
• Commonly used conducting materials are
  ক

  Copper

  খ

  Aluminium

  গ

  Both A and B

  ঘ

  Copper and silver

  ঙ

  Platinum and gold
• Which of the following are non-conductors of electricity?
  ক

  Non-metal solids except carbon

  খ

  Air and most other gases

  গ

  Pure water and liquids in general except mercury

  ঘ

  All of the above
• The conductivity of an extrinsic semiconductor with temperature
  ক

  Decreases

  খ

  Increases

  গ

  Remains constant

  ঘ

  All of the above
• Which of the following materials is the best conductor of electricity ?
  ক

  Tungsten

  খ

  Aluminium

  গ

  Copper

  ঘ

  Carbon
• Which of the following is the poorest conductor of electricity ?
  ক

  Carbon

  খ

  Steel

  গ

  Silver

  ঘ

  Aluminium
• Superconducting metal in super conducting state has relative permeability of
  ক

  Zero

  খ

  One

  গ

  Negative

  ঘ

  More than one
• Effect of moisture on the insulating materials is to
  ক

  Decrease dielectric constant

  খ

  Decrease dielectric strength

  গ

  Decrease insulation resistance

  ঘ

  Increase dielectric loss

  ঙ

  All of the above
• Steel wire is used as
  ক

  Overhead telephone wire

  খ

  Earth wire

  গ

  Core wire of ACSR

  ঘ

  All of the above
• The conductivity of a metal is determined by
  ক

  The electronic concentration and the mobility of the free electrons

  খ

  The number of valence electrons per atom

  গ

  Either A or B

  ঘ

  None of the above
• Which of the following is an advantage of stranded conductor over equivalent single conductor ?
  ক

  Less liability to kink

  খ

  Greater flexibility

  গ

  Less liability to break

  ঘ

  All of the above
• Due to which of the following fact, in India, aluminium is replacing copper ?
  ক

  Aluminium is more ductile and malleable than copper

  খ

  Aluminium is available in plenty, cheaper and lighter than copper

  গ

  Aluminium has lower resistivity than that of copper

  ঘ

  Aluminium has less temperature co-efficient than copper
• Surface resistance of an insulating material is reduced due to the
  ক

  Smoky and dirty atmosphere

  খ

  Humidity in the atmosphere

  গ

  Both A and B

  ঘ

  Neither A nor B
• If the resistance of a conductor does not vary in accordance with Ohm’s law it is known as
  ক

  non-linear conductor

  খ

  reverse conductor

  গ

  bad-conductor

  ঘ

  non-conductor
• In thermocouples which of the following pairs is commonly used ?
  ক

  Copper-constantan

  খ

  Aluminium-tin

  গ

  Silver-German silver

  ঘ

  Iron-steel
• Due to which of the following reasons aluminium does not corrode in atmosphere ?
  ক

  Aluminium is a noble metal

  খ

  Atmospheric oxygen can only diffuse very slowly through the oxide layer which is formed on the surface of aluminium

  গ

  No reaction with oxygen occurs ft Any of the above

  ঘ

  All of the above
• Addition of 0.3 to 4.5% silicon to iron __________ the electrical resistivity of iron.
  ক

  Increases

  খ

  Decreases

  গ

  Does not change

  ঘ

  Change
• The carbon percentage is least in
  ক

  low carbon steel

  খ

  wrought iron

  গ

  cast iron

  ঘ

  malleable iron
• The transition temperature of mercury is
  ক

  18.0°K

  খ

  9.22°K

  গ

  4.12°K

  ঘ

  1.14°K
• Which of the following high resistance materials has the highest operating temperature ?
  ক

  Kanthal

  খ

  Manganin

  গ

  Nichrome

  ঘ

  Eureka
• Thermocouples are mainly used for the measurement of
  ক

  Temperature

  খ

  Resistance

  গ

  Eddy currents

  ঘ

  Coupling co-efficient
• Due to which of the following reasons copper and aluminium are not used for heating elements ?
  ক

  Both have great tendency for oxidation

  খ

  Both have low melting point

  গ

  Very large length of wires will be required

  ঘ

  All of the above
• In a crystal, an atom vibrates at a frequency determined by
  ক

  The heat content of the crystal

  খ

  The temperature of the crystal

  গ

  The stiffness of the bonds it makes with neighbors

  ঘ

  All of the above
• Platinum is used in
  ক

  Electrical contacts

  খ

  Thermocouple

  গ

  Heating element in high temperature furnace

  ঘ

  Grids of special purpose vacuum tubes

  ঙ

  All of the above
• The forbidden gap in an insulator is
  ক

  Large

  খ

  Small

  গ

  Nil

  ঘ

  Any of the above
• Which of the following materials is preferred for transmitting electrical energy over long distance ?
  ক

  Copper

  খ

  Aluminium

  গ

  Steel reinforced copper

  ঘ

  Steel reinforced aluminium
• Which of the following material is not a semiconductor ?
  ক

  Silica

  খ

  Germanium

  গ

  Selenium

  ঘ

  Gallium-arsenide
• A carbon resistor contains
  ক

  Carbon crystals

  খ

  Solid carbon granules

  গ

  Pulverized coal

  ঘ

  Finely divided carbon black.
• Solder is an alloy of
  ক

  Copper and aluminium

  খ

  Tin and lead

  গ

  Nickel, Copper and zinc

  ঘ

  Silver, copper and lead